喷雾干燥法制备面粉改良剂茶多酚微胶囊研究

Study on microencapsulating of tea-polyphenols for the special additives for wheat flour quality improving

以面粉改良剂茶多酚为研究对象,选用海藻酸钠、壳聚糖以及氯化钙为包埋壁材,采用喷雾干燥法对茶多酚进行微胶囊化研究。通过单因素实验以及响应面优化分析得出如下结论,喷雾干燥最佳技术条件:进风温度180℃,空气流量750L/h,出风温度100℃。茶多酚最佳包埋参数为:复合壁材比例海藻酸钠2.5%、壳聚糖0.8%、氯化钙4.5%,芯材与壁材质量比为2∶1,最大包埋率为73.8%。包埋颗粒近似球形,直径介于2～10μm之间,分布均匀无粘连。微胶囊稳定性实验表明,在5℃下,茶多酚较为稳定,最佳储存期为22d。

Tea-polyphenol was encapsulated by sodium alginate and chitosan,and prepared by spray drying technology. The optimum conditions of microencapsulating were listed as follows：spray drying condition optimization included inlet air temperature of 180℃ ,air flow 750L/h,outlet air temperature of 100℃ ;the wall material optimization included that the mass ratio of the core and wall material was 2：1. The mass ratio of the wall materials were showed as follow：sodium alginate 2.5%（v/v）,chitosan 0.8% （v/v）,calcium chloride 4.5% （v/ v）. The best embedding rate was 73.8%,meanwhile the global microencapsulation diameter were nearly about 2-10μm. The favorite preservative condition was at 5℃ for 22d.